Bombogenesis occurs "when a midlatitude cyclone rapidly intensifies, dropping at least 24 millibars over 24 hours," according to the National Oceanic and Atmospheric Administration (NOAA).
A millibar measures atmospheric pressure. A drop in pressure in a system equals strengthening of the system.
Think of it as a winter hurricane.
Such weather systems in the northern hemisphere are centers of low pressure. When the pressure drops, the storms get stronger. When they drop in such a dramatic fashion over a short period of time, the results are equally dramatic.
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